Warp-stop mechanism for looms



' Oct. 12 1926. 1,603,248

"|. SNOW WARP STOP MECHANISM FOR LOOMS Filed May 26, 1926 2 Sheets-Sheet 1 JMM ATTORNEY Oct. 12 192s. 1,603,248

l. SNOW,

WARP STOP MECHANISM FOR LOOMS Filed May 26, 1926 2 Sheets-Sheet 2 Z VENTQR A TTORNEY ISAAC snow, or LAWRENCE, MASSACHUSETTS, AssIe-ivon TO DRAPER CORPORATION,

' 0F HOPEDALE, MASSACHUSETTS, ACORPORATION or MAINE.

WARP-STOP ivrncrramsivr r03 Looms.

' Application filed May 26,

This invention relates to mechanical warp stop mechanisms for .looms whereby, the loom is stopped on the occurrence of a fault in the warp threads.

v Looms are now ordinarily equipped with warp stop motion which is intended to thread as above noted may occur when one of the warp threads'breaks between the shedding mechanism and'the fell of the cloth.

hen this occurs, the end of the broken -warp thread is liable to extend laterally over adjacent warpthreads, and when the shed is changed the crossed end of the sion to be exerted upon some of the crossed warp threads and unless such condition is corrected, defective cloth will be woven.

The warp'stop mechanism of the present invention provides means whereby should a cross .in the warp take place and undue tension be given to one or more of the warp threads," the associated drop wire will be raised by the unduly cause loom stoppage.

tensioned thread and In accordance with the present invention,

sition by the warp threads during weaving and provision 1s made to effect loom stoppage should one of the warp threads break or become too slack for weavmg purposes,

.and also to stop the loom should one-'ofthe .warp ,threads become unduly t'ensioned,-

thereby lifting the associated 7 "drop wire above 1ts normal positlon; l

[The invention and new combination of --parts willbest be made clear from the fol- In"the,dra'wings: Fig. 1 is a perspective vlew w1th parts broken away showing a loom provided with.

r the present invention;

' Fig; 2 is an enlarged perspective detail showing one'of the warp threads as having been unduly tensioned and thereby lifting its associated dropwire to elfect loom stop-'1 page;

' Fig. 3 is a side elevation showing the drop 1926. Serial No. 111,851. 7

wire detector constituting a feature of the present invention; and r Fig. 4: is asection on the line 4- 4 of Fig. 3. a

Referring to the accompanying drawings,

the loom frame has mounted thereon, as

usual, the warp beam 1 from which the warp threads or pass over the usual whip roll 2, then to the warp stop mechanism, and

fromther'e through the shedding mechanism or'harnesses 3, from which point the warp threads extend through the usual reed 4 mounted on the lay 5. ,The finished cloth 7) extends over'the take-up roll 6 and, as

usual in looms of ordinary construction, the woven cloth is taken up as woven, but since the details of these features form no part of,

the present invention,- it is not deemed necessary to describe themin detail. broken warp thread Wlll cause undue ten- As-shown in the present instance of the invention, the warp stop mechanism is located between'the shedding mechanism or harnesses 3 and the rear of the loom or whip roll 2. Extending upwardly from the loom frame are the brackets 7 oneateach side of the loom, and adjustably mounted upon the supports 7 by bolts 10.- the drop wires are supportedin a normal poa The sidemembers 11 of the warp stop mechanism are shown in the present instance as providing a rest over which the -warp threads a pass on their way fromthe warp beam to the front of the loom.

wires to effect loom stoppage either when a warp thread breaks or becomes too slack,oor is unduly tensioned, as will more fully appear.

-As more clearly and 4, the drop wire detector 12 extends transversely of the loom between the sup ports 8 and is given a detecting movementin a direction transversely of'theloom. In the presentinstance, the drop wire detector 12 has drop wireengaging teeth or notches, not only along its upper edge, as indicated, but similarly along its lower edge, so that should a drop wire be released by a warp thread becoming broken or too slack, it will arrestillustrated in Figs. 2,-3'

mechanism which is associated with the drop the detector and efi'ect loom stoppage. On the other hand, should a drop Wire be unduly raised by an abnormally tensioned warp thread, it will engage the teeth along the lower -.edge ot the detector and similarly etlect loom stoppage.

In the present instance of the invention, the side brackets are provided with transversely extending slots, as indicated in Fig;

2, and have secured therein one or more stationary toothed bars 13, two being shown in the present instance of the invention, but it being understood-that only one of such stationary toothed bars may be used, as is common in the art. The detector 12 is pro vided with a slot 14 by which may be permitted its movement transversely of the loom and relative to the usual securing bolt 15. Along the top edge portion of the detee-tor 12 are series of teeth 16 thereby providing between each adjacent tooth a space 17 at the upper edge of the detector which may be engaged by the top portion ot'a drop wire 18 having an elongated slot 19, as usua. Likewise the stationary bars 13 are provided with similar teeth 20 along their upper edges, and the detector 12 is given a transverse movement relative to the toothed stationary bars, the construction being such that should a drop wire tail to be supported by its warp thread, it will drop and engage between the teeth of the detector and stationary bars and thereby arrest movement of the detector which through a train of mechanism thereby eilects loom stoppage.

The detector 12 is similarly provided along its lower edge with a series of teeth 21 which may be oi substantially the same character as the teeth along the upper edge, and similarly, the stationary bars 13 are provided with a series of teeth 22 along their lower edges, so that should a drop wire be abnormally raised by a tensioned warp thread due to a cross in the warp, the lower portion of the slot 19 in each drop wire will engage between thelower teeth in the detector and stationary bars 13 and arrest the detector, to thereby effect loom stoppage.

The teeth along the upper and lower edges of the detector are herein indicated as substantially rectangular in form but of course the shape of the teeth may be varied as may also the teeth on the stationary bars 13.

The drop wires 18 are each provided with an opening 28 through which a warp thread passes, with the result that normally the drop wires will be held in a normal weaving position, so that the detector 12 may partake of its detecting movement in a direction ransversely of the loom without ena drop wire either at the upper or lower end of the elongated slot 19, as indicated at'the right in Fig. 2, but instead of forming the eyes or openings 23 in thedr-op wires, they maybe provided with any other usual form of warp engaging element for sustain ng the drop wires by the normally conditioned warp threads.

In the illustration in Fig. 1, the drop wires 18 are arranged in two banks, but-it will obvious that any number of banks of drop wires may be employed.

in accordance with the present invention, the detector 12 is given a reciprocating movement transversely of the loom, and to efi'ectsuch movement any suitable train of mechanisn-i may be employed, but as indirated in Fig. 1 theend support 8 ofth'e warp stop mechanism has mounted thereon the rock shaft 24 carrying a rocking seat '25 for the actuator '26 which may tilt relative to the seat 25 about its end portions '27, and t to rock shaft '24 is connected by an arm 28 to a rod which has imparted thereto the usual movements of this type of warp stop mechanism to impart the transverse movement to the detector. The actuator 26 has associated with it an arm 3'0 pivotally mounted at 31 and connected at 32 to the actuator, the construction being such that should the detector be arrested in its transverse movements, the actuator 26 will be stopped, and consequently turned about one of its supports 27, as indicated in Fig. 1, to tl'ieroby actuate the arm 80 and through a sheathed wire 33 position a dog 34 in the path of hunter 35 secured to the lay 5. The dog 34: has connected to it a pull rod '36 which extends itr-ontwardly and is con' nee-ted to the shipper mechanism to efiect loom stoppage whenever the transversely movable detector is arrested in its detecting movements.

The details of the detector actuating means and the stopping mechanism rendered operative by the arrest of the detector may 7 all be of the same general character more fully shown and "described in the patent to Harry A. Davis and Arthur S. Johnson, No.

1,538,625, May 19, 1925, to which reference may be had for a more full disclosure of the details thereof.

When, during the weaving operation, a warp thread becomes broken or too slack for weaving purposes, the associated drop wire will drop and engage the upper teeth in the detector, thereby effecting loom stoppage. On the other hand, should a cross occur in the warp threads, one or more of the warp threads will be unduly tensioned in the formation of the shed and thereby raise the associated drop Wire from its normal to its abnormally 'raised position, as indicated at the left, Fig. 2, thereby causing the lower end portion of the. slot 19 to bring the lower wall of the slot into engagement Ill . construction described. thereof it will be noted that the loom will'be stopped should a warp thread break or become too slack for weaving purposes, and similarly the loom will be stopped should one or more of the warp'th'reads become unduly tension'ed,

so that the weaver may remedy the'warp fault without the cloth. 7 I

It has not been deemed necessary herein production of imperfect to describe in detail the actuating means for the transversely movable detector, nor to describe the details of the means for efl'ecting loom stoppage when the detector movement is arrested either by an abnormally raised or by an abnormally lowered drop f wire, because the details of such mechanism for moving the detector and'eitecting loom stoppage whenv its detecting movement is arrested are all fully shown and described in the patent hereinbetore mentioned.

What is claimed is:

1.- In a warp stop mechanism for looms, the combination of a seriesof drop wires normally supported by the warp threads during weaving, a drop wire detector exing a detecting movement transversely of the Y loom and provided with a series of teeth supported in normal position by the warp threads during weaving, a drop wire detector having a detecting movement in a direction transversely of the loom and provided with a series of teeth on its upper edge for engagement by a drop wire when in an abnormally 1,ow position and a series of teeth on its lower edge for engagement by a drop I Wire in an abnormally raised position, and means for stopping the loom when the detectormovement is arrested by either an abnormally lowered or an abnormally raised drop wire. 3. In a'warp stop'mechanism for loom the combination of a shedding mechanism, o

a series of drop wires normally supported by the warp threads during weav ng, a detector having a detecting movement trans- 'versely of the loom and provided with a series of teeth along its lower edge for engagement by a drop wire when it is abnor mally raised by an unduly tensioned warp thread, and means for stopping the loom when the detector movement is arrested by an unduly raised drop wire.

4:. In a warp stop mechanism for looms, I

the combination of a shedding mechanism. a series of drop wires having elongated slots and normally supported by the warp threads during weaving, a drop wire detector hav- -tending through the slots of the drop wires andprovided with a series of teeth along its lower edge and having a detecting movement transversely of the loom, and means for stopping the loom when the detector movement is arrested by an abnormally raised dropwire engaging a tooth along the lower edge of the detector.

5. In a warp stop mechanism for looms.

the combination of ,a series of drop wires normally supported by the warp threads during weaving, a transverselymovable detector having teeth along its upper and lower edges, a stationary'toothed bar extending transversely of the loom and having teeth along its upper and .loweredges that the movable detector maybe arrested in its detecting movement by an abnormally raised or an abnormally lowered drop wire.

In testimony whereo fiI have signed my name to this specification.

ISAAC SNOW. 

